PT-2022-21946 · Insyde · Insydeh2O Uefi Firmware

Published 2022-11-14 · Updated 2025-04-30 · CVE-2022-33984

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions InsydeH2O UEFI firmware kernel versions prior to 5.2: 05.27.25 InsydeH2O UEFI firmware kernel versions prior to 5.3: 05.36.25 InsydeH2O UEFI firmware kernel versions prior to 5.4: 05.44.25 InsydeH2O UEFI firmware kernel versions prior to 5.5: 05.52.25

Description The issue is related to DMA transactions targeted at input buffers used for the SdMmcDevice software SMI handler, which could cause SMRAM corruption through a Time-of-Check-to-Time-of-Use (TOCTOU) attack. This was discovered by Insyde engineering based on a description provided by Intel's iSTARE group.

Recommendations For kernel versions prior to 5.2: 05.27.25, update to kernel 5.2: 05.27.25 or later. For kernel versions prior to 5.3: 05.36.25, update to kernel 5.3: 05.36.25 or later. For kernel versions prior to 5.4: 05.44.25, update to kernel 5.4: 05.44.25 or later. For kernel versions prior to 5.5: 05.52.25, update to kernel 5.5: 05.52.25 or later.

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2022-33984

Affected Products

Insydeh2O Uefi Firmware

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2022-33984 · Security Note
• https://osv.dev/vulnerability/CVE-2022-33984 · Vendor Advisory
• https://insyde.com/security-pledge/SA-2022054 · Vendor Advisory
• https://insyde.com/security-pledge · Vendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-450613.pdf · Note
• https://t.me/cvenotify/120391 · Telegram Post